Card edge connector

Abstract

A card edge connector includes an insulating body and two rows of conductive terminals, the insulating body includes two side walls and a card slot between the two side walls, each row of conductive terminals is arranged on the corresponding side wall and includes a plurality of signal terminals and ground terminals, the conductive terminals include a holding portion, a contact portion and a soldering leg, two adjacent conductive terminals in each row form a terminal pair, the two soldering legs of each terminal pair are aligned with each other in the longitudinal direction, and the soldering legs of adjacent terminal pairs are offset from each other in the longitudinal direction so that the soldering legs of the two rows of conductive terminals are arranged in four rows; the soldering leg is a perforated pin structure, and the arrangement mode of the terminal pair includes at least two modes: one is that all the terminals are composed of signal terminals and ground terminals; the other is that part of the terminal pairs are composed of signal terminals and ground terminals, and the remaining terminal pairs are composed of signal terminals and signal terminals. The present application places the ground terminal soldering leg next to the signal terminal soldering leg in the closest manner, effectively reducing interference during signal transmission.

Description

[Technical Field]

[0001] This invention relates to a card edge connector, and more particularly to different arrangements of its terminal solder pins. [Background Technology]

[0002] Chinese invention patent CN107658585A discloses a connector, comprising: an insulating body with a slot and a first pair of terminals and a second pair of terminals disposed on the insulating body. The first pair of terminals and the second pair of terminals are staggered along the longitudinal direction on the same side of the slot. Two first solder portions of the first pair of terminals are offset from two first contact portions in opposite directions along the longitudinal direction. Similarly, two second solder portions of the second pair of terminals are offset from two second contact portions in opposite directions along the longitudinal direction. Furthermore, the first solder portions of the first pair of terminals and the first solder portions of the second pair of terminals are distributed laterally on opposite sides of the first body portion of the first pair of terminals and on opposite sides of the second body portion of the second pair of terminals. Both the first pair of terminals and the second pair of terminals in this application are signal terminals, which are prone to signal crosstalk.

[0003] Therefore, it is indeed necessary to provide an improved edge connector to overcome the above-mentioned defects. [Summary of the Invention]

[0004] The technical problem to be solved by the present invention is to provide a card edge connector that can reduce interference during signal transmission.

[0005] This invention is achieved through the following technical solution: a snap-fit ​​connector, comprising a longitudinally elongated insulating body and two rows of conductive terminals. The insulating body includes two opposing sidewalls extending longitudinally and a slot formed between the two sidewalls. Each row of conductive terminals is disposed on a corresponding sidewall and includes multiple signal terminals and multiple ground terminals. Each conductive terminal includes a holding portion fixed to the insulating body, a contact portion extending upward from the holding portion into the slot, and a soldering pin extending downward from the holding portion. Two adjacent conductive terminals in each row constitute a terminal pair, wherein the two soldering pins of each terminal pair are in the longitudinal direction... The terminals are aligned with each other, while the soldering pins of adjacent terminal pairs are offset from each other in the longitudinal direction, so that the soldering pins of the two rows of conductive terminals are arranged in four rows; the soldering pins are needle-shaped structures, and the terminal pairs are arranged in three ways: Arrangement 1 is that each terminal pair consists of a signal terminal and a ground terminal; Arrangement 2 is that some terminal pairs consist of a signal terminal and a ground terminal, and the remaining terminal pairs consist of signal terminals and signal terminals; Arrangement 3 is that some terminal pairs consist of a signal terminal and a ground terminal, some terminal pairs consist of signal terminals and signal terminals, and the remaining terminal pairs consist of ground terminals and ground terminals.

[0006] Furthermore, the distance between the solder feet of adjacent terminal pairs in the longitudinal direction is equal to the distance between the two solder feet of the terminal pair.

[0007] Furthermore, the distance between the solder feet of adjacent terminal pairs in the longitudinal direction is less than the distance between the solder feet of adjacent terminal pairs in the transverse direction perpendicular to the longitudinal direction.

[0008] Furthermore, the two rows of conductive terminals are divided into left and right groups in the longitudinal direction; the conductive terminals in the left group, starting from the leftmost side, form a terminal pair with two adjacent conductive terminals; the conductive terminals in the right group, starting from the rightmost side, form a terminal pair with two adjacent conductive terminals.

[0009] Furthermore, the arrangement of two adjacent signal terminals includes combining them into a terminal pair, or combining them with the grounding terminal next to them into two adjacent terminal pairs.

[0010] Furthermore, the welding feet of adjacent terminal pairs include a row of first welding feet and a row of second welding feet located on the inner and outer sides of the lateral direction, respectively; the holding portions of each row of conductive terminals are arranged in a row along the longitudinal direction, and the contact portions of each row of conductive terminals are arranged in a row along the longitudinal direction.

[0011] Furthermore, the distance between the soldering feet of the same terminal is 0.85 mm.

[0012] Furthermore, the distance between the first welding foot and the second welding foot in the lateral direction is 1.4 mm.

[0013] Furthermore, the distance between the first welding pin in one row of conductive terminals and the first welding pin in another row is 2.4 mm in the lateral direction.

[0014] Furthermore, the card edge connector is used to mount to a circuit board, the circuit board having a through hole corresponding to each solder pin, the through hole having a diameter of 0.66 mm.

[0015] Compared with the prior art, the present invention has the following advantages: the present invention places the soldering pin of the grounding terminal next to the soldering pin of the signal terminal in the closest manner, which effectively reduces interference during signal transmission. [Attached Image Description]

[0016] Figure 1 This is a perspective view of the combination of the card edge connector, circuit board and card module of the present invention.

[0017] Figure 2 yes Figure 1 The exploded view of the card edge connector is shown.

[0018] Figure 3It shows the mating diagram of the conductive terminals and the circuit board, as well as an enlarged view of some of their structures.

[0019] Figure 4 yes Figure 3 A top view of the conductive terminals mating with the circuit board.

[0020] Figure 5 yes Figure 4 Enlarged view of the structure within the Chinese frame.

[0021] Figure 6 This is a front view of some adjacent conductive terminals.

[0022] Figure 7 It is a three-dimensional view of some adjacent conductive terminals.

[0023] Figure 8 This is a diagram showing the connection between the conductive terminals and the circuit board in the second embodiment of the present invention, and an enlarged view of part of its structure.

[0024] Figure 9 This is a front view of some adjacent conductive terminals in the second embodiment.

[0025] Figure 10 This is a perspective view of some adjacent conductive terminals in the second embodiment.

[0026] Figure 11 This is a perspective view of the combination of the card edge connector, circuit board and card module according to the third embodiment of the present invention.

[0027] Figure 12 yes Figure 11 Exploded 3D view of the center-mounted card edge connector.

[0028] Figure 13 This is a diagram showing the connection between the conductive terminals and the circuit board in the third embodiment of the present invention, and an enlarged view of part of its structure.

[0029] [Explanation of Key Component Symbols]

[0030] Card edge connector 100, solder pins 23, 23'

[0031] Insulating body 10 terminal pairs 201, 201', 201a, 201b

[0032] Card slot 101 First welding pin 231

[0033] Side wall 11 Second welding foot 232

[0034] Tower-shaped part 12, metal sheet 3

[0035] Conductive terminal 20, locking mechanism 4

[0036] Signal terminals 20S distances L1, L2, L3, L4, L1’

[0037] Ground terminal 20G Circuit board 200

[0038] Contact portion 21 Through hole 210

[0039] Retention portion 22 Card module 300

[0040] Edge card connector 900 Signal terminals 80S

[0041] Insulating body 90 Ground terminal 80G

[0042] Side wall 91 Welding feet 81

[0043] Circuit board 800 Terminal pair 801

[0044] Conductive terminal 80 Through hole 810

[0045] Hole 820

[0046] The following specific embodiments will further illustrate the present invention in conjunction with the above drawings.

Specific Embodiments

[0047] Please refer Figures 1 to 7 As shown, an edge card connector 100 is welded to a circuit board (PCB) 200 for receiving a card module 300 to complete the transmission of DDR5 signals. When the welding feet with a needle-like structure of traditional terminals transmit signals, their high-frequency performance cannot reach that of surface-mounted welding feet. Therefore, a new arrangement method of welding feet with a DDR5 needle-like structure is proposed.

[0048] Refer Figure 1-2 As shown, the insulating body 10 includes two oppositely arranged side walls 11 extending along the longitudinal direction, a tower-shaped portion 12 at the end of the insulating body 10, and a card slot 101 formed between the two side walls. The edge card connector 100 includes a metal sheet 3 installed on the tower-shaped portion 12 and a rotatable locking mechanism 4. The locking mechanism 4 locks the card module 300 by rotating and opening / closing. The metal sheet 3 is used to strengthen the strength of the tower-shaped portion 12 and extend the service life of the tower-shaped portion 12.

[0049] Refer Figure 3-7 , each row of conductive terminals 20 is arranged on the corresponding side wall 11 and includes a plurality of signal terminals 20S and a plurality of ground terminals 20G, and the signal terminals and the ground terminals are arranged at intervals. The conductive terminal 20 includes a retention portion 22 fixed to the insulating body 10, a contact portion 21 extending upward from the retention portion and bending into the card slot 101, and a welding foot 23 extending downward from the retention portion. The welding foot is in a needle-like structure or a through-hole shape. Refer Figure 6-7As shown, it is a through-hole structure that can pass through the through-hole 210 of the circuit board 200. Two adjacent conductive terminals 20 in each row form a terminal pair 201, where the two solder pins 23 of each terminal pair are aligned with each other in the longitudinal direction, while the solder pins 23 of adjacent terminal pairs 201 are offset from each other in the longitudinal direction, resulting in four rows of solder pins 23 for the two rows of conductive terminals. The solder pins 23 are pin-shaped structures that can be inserted into the through-hole 210 of the circuit board. In the terminal arrangement design, adjacent signal terminals and ground terminals are arranged into a terminal pair as much as possible. This ensures that the ground terminal is closest to the side of the solder pin of the signal terminal, thus improving signal interference. Various situations can arise due to the number or arrangement of the signal terminals and ground terminals in the entire connector. In the preferred embodiment, both signal terminals and ground terminals can form a terminal pair, i.e., arrangement one is that each terminal pair consists of a signal terminal 20S and a ground terminal 20G. Under certain terminal quantities and arrangements, most terminals can form terminal pairs of signal terminals and ground terminals, with the closest distance to the solder pin of the signal terminal being the ground terminal. However, a small number of signal terminals form a terminal pair with each other, or the remaining terminals are either single signal terminals or ground terminals. That is, in arrangement two, some terminal pairs consist of signal terminal 20S and ground terminal 20G, while the remaining terminal pairs consist of signal terminals 20S and 20S. In some cases, most terminals can form terminal pairs of signal terminals and ground terminals, with the closest distance to the solder pin of the signal terminal being the ground terminal. However, a small number of signal terminals form a single terminal pair, and a small number of ground terminals form a single terminal pair with each other.

[0050] In summary, there are three possible arrangements for terminal pairs 201: Arrangement 1 consists of a signal terminal 20S and a ground terminal 20G for each terminal pair; Arrangement 2 consists of some terminal pairs consisting of a signal terminal 20S and a ground terminal 20G, while the remaining terminal pairs consist of two signal terminals; Arrangement 3 consists of some terminal pairs consisting of a signal terminal 20S and a ground terminal 20G, some terminal pairs consisting of two signal terminals, and the remaining terminal pairs consisting of two ground terminals. In these arrangements, the ground terminal 20G's solder pin is placed closest to the solder pin 23 of the signal terminal 20S, effectively reducing interference during signal transmission, improving the high-frequency performance of the pin-shaped solder pins, achieving high-frequency performance equivalent to surface mount solder pins, while being relatively cheaper than surface mount solder pins, making it easier for customers to implement on a large scale and resulting in higher manufacturing yield.

[0051] In this embodiment, most of the terminal pairs 201a are composed of a signal terminal 20S and a ground terminal 20G, and a small number of terminal pairs 201b are composed of two signal terminals 20S. Moreover, the left and right positions of the signal terminal 20S and the ground terminal 20G in the longitudinal direction in different terminal pairs 201a are changed. Refer Figure 5 . Continue to refer Figure 3-5 . The two rows of conductive terminals are divided into left and right groups in the longitudinal direction; for the conductive terminals in the left group, starting from the leftmost side, every two adjacent conductive terminals 20 form a terminal pair 201; for the conductive terminals in the right group, starting from the rightmost side, every two adjacent conductive terminals 20 form a terminal pair 201. It should be noted that the arrangement of two adjacent signal terminals 20S includes being combined with each other to form one of the above-mentioned terminal pairs 201b, or being respectively combined with the adjacent ground terminals on their sides to form two adjacent terminal pairs 201a.

[0052] Refer Figure 5-7 As shown, the distance L2 between the welding feet 23 of adjacent terminal pairs 201 in the longitudinal direction is equal to the distance L1 between the two welding feet of the terminal pair. The distance L2 between the welding feet of adjacent terminal pairs in the longitudinal direction is less than the distance L3 between the welding feet of adjacent terminal pairs in the transverse direction perpendicular to the longitudinal direction. Specifically, the welding feet of adjacent terminal pairs include a row of first welding feet 231 and a row of second welding feet 232 located on the inner and outer sides of the transverse direction respectively; the holding parts 22 of each row of conductive terminals are arranged in a row along the longitudinal direction, and the contact parts 21 of each row of conductive terminals are arranged in a row along the longitudinal direction.

[0053] In this embodiment, the distance L1 between the welding feet of the same terminal pair is 0.85 millimeters (mm). The distance L3 between the first welding feet 231 and the second welding feet 232 in the transverse direction is 1.4 mm. The distance L4 between the first welding feet 231 in one row of conductive terminals and the first welding feet 231 in the other row in the transverse direction is 2.4 mm. The increased distance between the two rows of conductive terminals 20 can reduce signal interference. The circuit board 200 is provided with through holes 210 corresponding to each welding foot, and the inner diameter of the through holes 210 is 0.54 mm. On the one hand, it ensures a safety margin for the spacing between the through holes 210 to ensure the welding distance; on the other hand, it reduces the capacitive effect of the through holes 210 and improves the high-frequency performance. In other embodiments, the distance between the welding feet 23 can be adjusted according to actual situations to meet the actual process requirements. At the same time, the size of the through holes 210 and the material of the circuit board can be adjusted according to actual needs.

[0054] Refer Figure 8-10As shown in the figure, in the second embodiment of the present invention, the difference is that the welding feet 23' of each terminal pair 201' are offset relative to the center line of the terminal, so that the distance L1' between the welding feet 23' of the same terminal pair is increased, so as to leave enough safety distance on the PCB circuit board, and at the same time, the high-frequency performance of signal transmission can be adjusted.

[0055] As shown in Figure 11-13 the figure, in the third embodiment of the present invention, the basic structure of the edge connector 900 is basically the same as that of the edge connector 100 in the first embodiment, and it is welded to the circuit board (PCB) 800. The edge connector 900 includes a longitudinally extending insulating body 90 and two rows of conductive terminals 80. The insulating body 90 includes two oppositely arranged side walls 91 extending in the longitudinal direction. Each row of conductive terminals 80 is arranged on the corresponding side wall 91 and includes a plurality of signal terminals 80S and ground terminals 80G. The conductive terminal 80 includes a welding foot 81 for welding to the circuit board 800. The welding foot 81 is a needle-shaped pin. Two adjacent conductive terminals 80 in each row form a terminal pair 801. The two welding feet 81 of each terminal pair 801 are aligned with each other in the longitudinal direction, while the welding feet of adjacent terminal pairs 801 are offset from each other in the longitudinal direction so that the welding feet 81 of the two rows of conductive terminals are arranged in four rows. The circuit board 800 is correspondingly provided with four rows of through holes 810 for the four rows of welding feet 81 to pass through. A row of holes 820 is added between every two rows of through holes on the circuit board 800. The holes 820 are located between the two rows of conductive terminals 80 on the circuit board 800 and penetrate the upper and lower surfaces of the circuit board 800. The holes 820 can reduce the far-end crosstalk between the two rows of conductive terminals 80 and enhance the high-frequency performance. In the optimal embodiment, the inner diameter of the holes 820 is 0.54 mm. In the optimal embodiment, the welding feet 81 of the conductive terminals 80 are the same as those in the first embodiment, that is, the welding feet are not offset. In other embodiments, the welding feet can also be offset according to the second embodiment. In summary, an edge connector combination includes an edge connector and a circuit board. The edge connector includes an insulating body and two rows of conductive terminals. The welding feet of each row of conductive terminals are divided into two rows. The circuit board is provided with corresponding four rows of through holes 910 and holes 820. The welding feet are inserted into the through holes. The holes 820 are located between the middle two rows of through holes and do not provide insertion for the welding feet of any conductive terminals.

[0056] The above is only a partial embodiment of the present invention, not all embodiments. Any equivalent changes made by those of ordinary skill in the art to the technical solution of the present invention by reading the specification of the present invention are covered by the claims of the present invention.

Claims

1. A card edge connector comprising a longitudinal insulating body and two rows of conductive terminals, the insulating body comprising two oppositely arranged and longitudinally extending side walls and a card slot formed between the two side walls, each row of the conductive terminals being arranged on a corresponding side wall and comprising a plurality of signal terminals and a plurality of ground terminals, the conductive terminals comprising a holding portion held by the insulating body, a contact portion upwardly and longitudinally extending from the holding portion into the card slot, and a solder tail downwardly and longitudinally extending from the holding portion, and wherein two adjacent conductive terminals in each row form a terminal pair, and wherein the two solder tails of each terminal pair are longitudinally aligned with each other, while the solder tails of adjacent terminal pairs are longitudinally offset from each other such that the solder tails of the two rows of conductive terminals are arranged in four rows. The soldering legs are needle-shaped structures, and the arrangement of the terminal pairs includes three types: arrangement type one is that each terminal pair is composed of a signal terminal and a ground terminal; arrangement type two is that some terminal pairs are composed of a signal terminal and a ground terminal, and the remaining terminal pairs are composed of a signal terminal and a signal terminal; arrangement type three is that some terminal pairs are composed of a signal terminal and a ground terminal, some terminal pairs are composed of a signal terminal and a signal terminal, and the remaining terminal pairs are composed of a ground terminal and a ground terminal.

2. The card edge connector of claim 1, wherein: The distance between the soldering legs of adjacent terminal pairs in the longitudinal direction is equal to the distance between the two soldering legs of the terminal pair.

3. The card edge connector of claim 2, wherein: The distance between the soldering legs of adjacent terminal pairs in the longitudinal direction is less than the distance between the soldering legs of adjacent terminal pairs in the transverse direction perpendicular to the longitudinal direction.

4. The card edge connector of claim 1, wherein: The two rows of conductive terminals are divided into left and right groups in the longitudinal direction; the conductive terminals in the left group, starting from the leftmost side, form a terminal pair with the adjacent two conductive terminals; the conductive terminals in the right group, starting from the rightmost side, form a terminal pair with the adjacent two conductive terminals.

5. The card edge connector of claim 4, wherein: The arrangement of the two adjacent signal terminals includes combining them into a terminal pair or combining each with the ground terminal on its side into two adjacent terminal pairs.

6. The card edge connector of claim 1, wherein: The soldering legs of adjacent terminal pairs include a row of first soldering legs and a row of second soldering legs on the inner and outer sides of the transverse direction, respectively; the holding portions of each row of conductive terminals are arranged in a row along the longitudinal direction, and the contact portions of each row of conductive terminals are arranged in a row along the longitudinal direction.

7. The card edge connector of claim 6, wherein: The distance between the soldering legs of the same terminal pair is 0.85 mm.

8. The card edge connector of claim 7, wherein: The distance between the first soldering leg and the second soldering leg in the transverse direction is 1.4 mm.

9. The card edge connector of claim 7, wherein: The distance between the first soldering leg in one row of conductive terminals and the first soldering leg in another row in the transverse direction is 2.4 mm.

10. The card edge connector of claim 1, wherein: The card edge connector is mounted to a circuit board, and the circuit board is provided with a through hole corresponding to each soldering leg, and the diameter of the through hole is 0.54 mm.

Images